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Acoustic emission signal analytical method for automatically identifying damage mode of thermal barrier coating

A technology of acoustic emission signal and thermal barrier coating, which is applied in the direction of using acoustic emission technology for material analysis, processing the response signal of detection, etc.

Active Publication Date: 2013-12-11
XIANGTAN UNIV
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Problems solved by technology

Therefore, the analysis of a single signal must consume a lot of manpower, and the analysis has a certain lag

Method used

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  • Acoustic emission signal analytical method for automatically identifying damage mode of thermal barrier coating
  • Acoustic emission signal analytical method for automatically identifying damage mode of thermal barrier coating
  • Acoustic emission signal analytical method for automatically identifying damage mode of thermal barrier coating

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Embodiment

[0099] Taking the tensile failure process of thermal barrier coatings at room temperature as an example, the automatic pattern recognition of damage acoustic emission signals was carried out. Among them, the thermal barrier coating sample is prepared by plasma spraying method, the substrate material is Ni-based superalloy steel GH3030, and the bonding layer material is NiCr 22 al 7 Y 0.2 (wt.%), the ceramic layer material is ZrO 2 -8wt.%Y 2 o 3 , the thicknesses of the bonding layer and the ceramic layer are 100 μm and 200 μm, respectively. In the tensile test, a universal testing machine was used to load the sample, and the loading rate was 0.3mm / min. When loading, attach the acoustic emission sensor to both ends of the sample, collect the signal through the acoustic emission instrument, the sampling frequency is 2MHz, and the threshold is set to 38dB. The experiment carried out the acoustic emission detection of the tensile failure process of the base material without ...

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Abstract

An acoustic emission signal analytical method for automatically identifying the damage mode of a thermal barrier coating belongs to the technical field of the lossless real-time failure detection of thermal barrier coatings. The acoustic emission signal analytical method comprises the following steps: acquiring acoustic emission signals of the thermal barrier coating damage; performing wavelet packet transform of the acoustic emission signals, and extracting a wavelet energy spectrum coefficient serving as the characteristic parameters of mode identification; establishing a BP nerve network classification system, training the BP network, and obtaining the trained BP network; extracting the wavelet energy spectrum coefficient of an acoustic emission signal to be identified, inputting the wavelet energy spectrum coefficient into the trained BP network, and identifying the damage mode of the acoustic emission signal; accounting the number of each damage acoustic emission event, and obtaining a curve of the relation between numbers of various damage acoustic emission signals and an external load. The acoustic emission signal analytical method performs real-time or in-situ lossless detection of failure process, and provides a direct basis and guide for correctly understanding the failure action of the thermal barrier coating. Moreover, the acoustic emission signal analytical method can accurately identify the acoustic emission signals of different damage modes of the thermal barrier coating, and has great significance for real-time detection of the failure process of the thermal barrier coating.

Description

technical field [0001] The invention relates to an acoustic emission signal analysis method for automatic identification of thermal barrier coating damage modes, and belongs to the technical field of non-destructive real-time detection of thermal barrier coating failure. Background technique [0002] The concept of thermal barrier coating was proposed by the NASA Research Center of the United States in 1953. It is a ceramic coating with very low thermal conductivity and excellent high temperature oxidation resistance. It is deposited on high temperature resistant metals or alloys through a bonding layer. The surface can effectively isolate the high-temperature metal or alloy from the high-temperature gas, so as to reduce the surface working temperature of the high-temperature component or alloy and protect it from the corrosion and erosion of the high-temperature gas, greatly prolonging the use of the high-temperature metal or alloy Life, and then improve the gas temperature...

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Application Information

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IPC IPC(8): G01N29/14G01N29/44
Inventor 杨丽康海松周益春蔡灿英
Owner XIANGTAN UNIV
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